So im very confused, im looking at getting a powerline adapter but I noticed in my room there is an ethernet port (2nd floor) my router is on the first floor, i looked to see if there was any ethernet port in the wall, all i saw was 1 cable port and just regular wall outlets. My question is how and why is there an ethernet port in my room 2nd floor but my router isnt plugged into an ethernet port on the wall??????